CN101358272A - Method for preparing high grade non-oriented electrical steel adding rare earth cerium - Google Patents
Method for preparing high grade non-oriented electrical steel adding rare earth cerium Download PDFInfo
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- CN101358272A CN101358272A CNA2008102220053A CN200810222005A CN101358272A CN 101358272 A CN101358272 A CN 101358272A CN A2008102220053 A CNA2008102220053 A CN A2008102220053A CN 200810222005 A CN200810222005 A CN 200810222005A CN 101358272 A CN101358272 A CN 101358272A
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Abstract
A preparation method of high grade non-oriented electrical steel added with rear earth cerium belongs to the technical field of electrical steel. High Si non-oriented electrical steel casting blank added with rare earth Ce is taken as the hot rolling material, and final high grade non-oriented electrical steel product with excellent magnetic property is obtained through hot rolling, normalizing, acid cleaning, cold rolling, anneal and coating; the design of hot rolling material components is required to meet that: C content is less than or equal to 0.005 percent, Si content is from 2.4 percent to 3.3 percent, Mn content is from 0.1 percent to 0.6 percent, Al content is from 0.8 percent to 1.5 percent, P content is less than or equal to 0.02 percent, S content is from 0.003 to 0.006 percent, N contend is less than or equal to 0.008 percent, O content is less than or equal to 0.015 percent, rare earth Ce is from 0.0015 percent to 0.0300 percent, the ratio of Ce and S is controlled from 0.7 to 7.0, the rest components are Fe and unavoidable impurities, and the component contents are based on weight percentage; the final magnetic property of the product is that when the thickness is 0.35mm, P1.2/50 is equal to 2.1W/kg to 2.6 W/kg, and B5000/50 is equal to 1.68T to 1.70T; when the thickness is 0.50mm, P1.5/50 is equal to 2.21 W/ kg to 2.54 W/ kg, and B5000/50 is equal to 1.70T to 1.72T. The method has the advantage of low production cost.
Description
Technical field
The invention belongs to the electrical steel technical field, a kind of high grade non-oriented electrical steel of adding rare earth cerium particularly is provided, and (the non-oriented high grade electrical steel is that electrical steel production researchist satisfies P to magnetic property
1.5/50≤ 4.40W/kg, B
5000/50Also reach simultaneously the general designation of all non-oriented electrical steel products of GB regulation minimum requirements) the preparation method, this electrical steel product has good magnetic property.
Background technology
Silicon steel be silicon content about 3%, other mainly is the ferro-silicon of iron.Being the indispensable important non-retentive alloy of electric power, electronics and war industry, also is the Metallic Functional Materials of output maximum, mainly is used as the iron core of various motors, generator and transformer.Its complex manufacturing, the manufacturing technology strictness, production technology both domestic and external is all protected with the patent form, is considered as the life of enterprise.
High grade non-oriented silicon steel is the high-end product in the non orientating silicon steel, is mainly used in to make large and medium-sized waterpower, thermoelectric generator.Wherein low iron loss high grade non-oriented silicon steel sheet 35W230～35W210, the domestic small serial production only of 50W250～50W230 trade mark, and quality instability, it is very high to S content requirement in the steel to make high grade non-oriented silicon steel, in general requirement N, O, the S≤10ppm, present steel-smelting technology is reduced to this level with S will adopt the special S technology of taking off, and cost nearly doubles and is difficult to stably manufactured.High grade non-oriented silicon steel simply is described below in the Chinese patents characteristics:
1, Chinese patent CN 1078270A discloses a kind of production method that contains the rare earth cold rolling non-oriented electrical steel, it is characterized in that the magnetic that obtains with Ni, Cu, Sn, Sb, C, P, Ca or rare earth element wherein under the situation that has added other alloying element, also requiring Sn, Sb and Ca, rare earth must respectively add at least a.Iron loss P
1.5/50Can reach 2.45W/kg when minimum, but its Heating temperature height, the steel interalloy is more, increases metallurgical cost, and needs humidification decarburizing annealing, and annealing speed is slow.
2, Chinese patent CN 1887512 discloses a kind of non-oriented electrical steel and manufacture method thereof that may add rare earth, it is characterized in that: this non-oriented magnetic steel sheet is in quality %, contain Si:2.0% or following, Mn:3.0% or following, Al:1.0～3.0%, also contain as required and add up to 0.002～0.5% Sn, Sb, Cu, Ni, Cr, P, REM, Ca, Mg; About the rolling direction after the stress relieving.Iron loss P
1.5/50Can arrive 2.0W/kg or following when minimum.This patent magnetic is better, but Si content is lower in its steel, and other alloys such as Mn, Al, Cu are more, the cost height, and this is external to have adopted process annealing and skin pass rolling in cold rolling, and this technology is secondary cold-rolling, and operation increases, and the cost that needs is higher.
3, Chinese patent CN 1827820 discloses a kind of non-oriented electrical steel and manufacture method thereof, it is characterized in that Si:0.08～1.30%, Sb:0.0050～0.050%, B:0.0005～0.005%, Ca or REM0.005～0.10%, this invention uses alloy numerous, because Si content is lower, magnetic is lower, P
1.5/50Can only reach 3.152W/kg when minimum, can only be as the magnetically soft alloy material of producing general electric machine iron core.
4, Chinese patent CN 10099905 discloses a kind of non-oriented electrical steel and manufacture method thereof; it is characterized in that C≤0.01%, Si0.1～3.50%, Al≤1.5%; Mn:0.10～1.5%; P≤0.2%, S≤0.008%, N≤0.003%. smelting, continuous casting, hot rolling, normalizing are handled; hot-rolled sheet is carried out normalizing to be handled: implement perhydro annealing under the bell furnace condition; since adopt bell furnace, so its rate ratio is lower, the cost height.
5, Chinese patent CN 1305019 discloses a kind of the present invention and has contained Si:1.5～8.0% (quality) and Mn:0.005～2.5% (quality), and C, S, N, O and B content are suppressed at below the 50ppm respectively, and contain Al, Sb, Ni, Sn, Cu, P and the Cr etc. of trace.Add the alloying element height, cost increases.
6, Chinese patent CN 1133891 discloses a kind of method for making of invention non-oriented magnetic steel sheet, Si, the Mn that 1.5wt% is following, the Al that 1.5wt% is following, the steel billet of the S that P that 0.2wt% is following and 0.01wt% are following carries out hot rolling, adopt once cold rolling or accompany twice of process annealing cold rolling, carry out final annealing then.Increase remains on 850～1150 ℃ of temperature to the gained thin slab makes the thin slab non-uniform temperature obtain the demulcent step; With to the thin slab stress application, promote the step of precipitate alligatoring in the thin slab.Improve the way of magnetic stability.Silicone content is lower in this patent, and be at middle grade silicon steel kind.
Summary of the invention
The object of the present invention is to provide a kind of preparation method of high grade non-oriented electrical steel of adding rare earth cerium, the electrical steel finished product has been had excellent magnetic characteristics, and reduced cost.
The advantage that the present invention gives prominence to has been to provide a kind of cost relatively inexpensive technique manufacturing method, promptly (S is 0.003～0.006%) passes through to add rare earth under the common S of taking off technical qualification, and the mass ratio of rare earth and sulphur is controlled at 0.1～10, mix precipitate so that generate the sulfide of rare earth or rare-earth sulfide and MnS etc., and thickization of precipitate, and then help matrix grain and grow up, improve magnetic property.
Strand of the present invention is high Si, contains higher S that by adding a certain amount of Rare-Earth Ce, through behind the hot rolling deformation, hot-rolled sheet adopts the rational Match of critical processes such as normalizing, once cold rolling and annealing, can produce the high grade non-oriented electrical steel product of excellent magnetic.
Technical scheme of the present invention:
The non-oriented electrical steel strand that adopts high Si to add Rare-Earth Ce is the hot rolling raw material, carries out hot rolling (not batching), normalizing, pickling, cold rolling, annealing, coating, obtains the high grade non-oriented electrical steel product of final excellent magnetic.
Its composition design is as follows:
C≤0.005%, Si 2.4～3.3%, Mn0.1～0.6%, Al 0.8～1.5%, P≤0.02%, S 0.003～0.006%, N≤0.008%, O≤0.015%, Rare-Earth Ce 0.0015～0.0300% and control Ce/S=0.7～7.0, all the other are Fe and unavoidable impurities.More than each component content be mass percent.
950～1150 ℃ of slab heating temperature, heat-up time 0.5～5h; The hot rolling start rolling temperature is at 950～1150 ℃, and finishing temperature is at 800～1000 ℃, and hot-rolled sheet thickness is 2.0～2.5mm.The normalizing temperature is that 900～1050 ℃, normalizing time are 60～300s; carry out pickling and once cold rolling then; be cold-rolled to 0.34～0.36mm or 0.47～0.50mm after the pickling, the cold-reduced sheet annealing temperature is that 900～1050 ℃, annealing time are 60～180s, and requiring annealing atmosphere is H
2, N
2Mixed gas, wherein H
2Ratio high more good more and require to be not less than 10%; Do not need the humidification decarburization during annealing, product annealing back outage furnace cooling to 500～400 ℃ are taken out air cooling then, can obtain having the product of above-mentioned typical magnetic property.The finished product grain size is at 100～200 μ m (seeing accompanying drawing 1).Carrying out coating after the annealing handles.
The finished product magnetic property is: when 0.35mm is thick, and P
1.5/50=2.1～2.6W/kg, B
5000/50=1.68～1.70T; 0.50mm when thick, P
1.5/50=2.21～2.54W/kg, B
5000/50=1.70～1.72T.Do not contain alloying elements such as Sn, Sb, Bi, Cu, Cr, Ni, B, Ca in the strand, and product to take off the S cost cheap relatively, so manufacturing cost is low.
Description of drawings
Fig. 1 is the finished product metallograph (100 times of following observationss of come card DIM5000M metaloscope) after the stress relief annealing of H invention steel in this patent.
Embodiment
Embodiment 1:
The chemical ingredients of experimental steel strand is as follows:
The main chemical compositions of table 1 experimental steel strand
Experimental steel is heated to 950～1150 ℃, is hot-rolled down to thickness 2.0～2.5mm behind insulation 0.5～5h, after 900～1050 ℃ * 60～300s normalizing, carries out pickling and cold-rolling to 0.35mm, and 900～1050 ℃ * 60～180s of annealing temperature, annealing atmosphere are 30%H
2+ 70%N
2Mixed gas need not decarburizing annealing, and the type of cooling is that fire door is cooled to 500～400 ℃, and air cooling carries out magnetic detection to room temperature then.0.35mm experimental steel product magnetic property sees Table 3.
Table 2 0.35mm experimental steel finished product magnetic property
Embodiment 2:
Experimental steel is heated to 1100～1150 ℃, is hot-rolled down to thickness 2.0～2.5mm behind insulation 0.5～5h, and after 900～1050 ℃ * 60～300s normalizing, pickling and cold-rolling is to 0.50mm, and 900～1050 ℃ * 60～180s of annealing temperature, annealing atmosphere are 30%H
2+ 70%N
2Mixed gas need not decarburizing annealing, and the type of cooling is that fire door is cooled to 500～400 ℃, and air cooling carries out magnetic detection to room temperature then.0.50mm experimental steel product magnetic property specifically sees Table 3:
Table 3 0.50mm experimental steel finished product magnetic property
Claims (5)
1, a kind of preparation method of high grade non-oriented electrical steel of adding rare earth cerium, it is characterized in that, the non-oriented electrical steel strand that adopts high Si to add Rare-Earth Ce is the hot rolling raw material, carry out hot rolling, normalizing, pickling, cold rolling, annealing, coating, obtain the high grade non-oriented electrical steel product of final excellent magnetic; Its hot rolling material composition design requirements is satisfied: C≤0.005%, Si:2.4～3.3%, Mn:0.1～0.6%, Al:0.8～1.5%, P≤0.02%, S:0.003～0.006%, N≤0.008%, 0≤0.015%, Rare-Earth Ce: 0.0015～0.0300%, and control Ce/S=0.7～7.0, all the other are Fe and unavoidable impurities, more than each component content be mass percent;
The final magnetic property of product is: when 0.35mm is thick, and P
1.5/50=2.1～2.6W/kg, B
5000/50=1.68～1.70T; 0.50mm when thick, P
1.5/50=2.21～2.54W/kg, B
5000/50=1.70～1.72T.
2, method according to claim 1 is characterized in that, 950～1150 ℃ of described slab heating temperature, heat-up time 0.5～5h.
3, method according to claim 1 and 2 is characterized in that, described hot rolling start rolling temperature is at 950～1150 ℃, and finishing temperature is at 800～1000 ℃, and hot-rolled sheet thickness is 2.0～2.5mm.
4, method according to claim 1 is characterized in that, described normalizing is at 900～1050 ℃, N with hot-rolled steel sheet
2Carry out 60～300s normalizing under the gas shiled, carry out pickling and once cold rolling then, cold rolling finished product thickness is 0.34～0.36mm or 0.47～0.50mm.
5, according to claim 1 or 4 described methods, described annealing is that cold rolling finished product is carried out anneal, and annealing temperature is 900～1050 ℃, and annealing time is 60～180s, and annealing atmosphere is the mixed gas of H2, N2, and the ratio of H2 is not less than 10%; Annealing back outage furnace cooling to 500～400 ℃ are taken out air cooling then, obtain the finished product grain size at 100～200 μ m.
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| CN104438328A (en) * | 2014-11-27 | 2015-03-25 | 武汉钢铁(集团)公司 | Hot rolling method for improving non-oriented silicon steel magnetic performance |
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| CN104438328A (en) * | 2014-11-27 | 2015-03-25 | 武汉钢铁(集团)公司 | Hot rolling method for improving non-oriented silicon steel magnetic performance |
| CN104805351A (en) * | 2015-04-23 | 2015-07-29 | 东北大学 | Ultrafine grain high-silicon electrical steel sheet and manufacturing method thereof |
| CN106282781A (en) * | 2016-10-11 | 2017-01-04 | 东北大学 | A kind of method preparing high intensity non-orientation silicon steel based on the precipitation strength of nanometer Cu |
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| CN109365530A (en) * | 2018-10-09 | 2019-02-22 | 鞍钢股份有限公司 | A kind of high-level non-orientation silicon steel hot continuous rolling process |
| CN110129671A (en) * | 2019-05-08 | 2019-08-16 | 武汉科技大学 | One kind non-orientation silicon steel thin belt of high intensity containing cerium and preparation method thereof |
| CN110129671B (en) * | 2019-05-08 | 2021-06-04 | 武汉科技大学 | Cerium-containing high-strength non-oriented silicon steel strip and preparation method thereof |
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| CN111560554A (en) * | 2020-05-06 | 2020-08-21 | 包头钢铁（集团）有限责任公司 | Preparation method of rare earth non-oriented silicon steel |
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Address after: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee before: Capital Iron & Steel General Company |
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